1 files changed, 338 insertions, 0 deletions
diff --git a/gfx/layers/ipc/CompositorManagerParent.cpp b/gfx/layers/ipc/CompositorManagerParent.cpp
new file mode 100644
index 0000000000..d0d7bb862b
--- /dev/null
+++ b/gfx/layers/ipc/CompositorManagerParent.cpp
@@ -0,0 +1,338 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/layers/CompositorManagerParent.h"
+#include "mozilla/gfx/GPUParent.h"
+#include "mozilla/gfx/CanvasManagerParent.h"
+#include "mozilla/webrender/RenderThread.h"
+#include "mozilla/ipc/Endpoint.h"
+#include "mozilla/layers/CompositorBridgeParent.h"
+#include "mozilla/layers/ContentCompositorBridgeParent.h"
+#include "mozilla/layers/CompositorThread.h"
+#include "mozilla/layers/SharedSurfacesParent.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/Unused.h"
+#include "gfxPlatform.h"
+#include "VsyncSource.h"
+
+namespace mozilla {
+namespace layers {
+
+StaticRefPtr<CompositorManagerParent> CompositorManagerParent::sInstance;
+StaticMutex CompositorManagerParent::sMutex;
+
+#ifdef COMPOSITOR_MANAGER_PARENT_EXPLICIT_SHUTDOWN
+StaticAutoPtr<nsTArray<CompositorManagerParent*>>
+    CompositorManagerParent::sActiveActors;
+#endif
+
+/* static */
+already_AddRefed<CompositorManagerParent>
+CompositorManagerParent::CreateSameProcess() {
+  MOZ_ASSERT(XRE_IsParentProcess());
+  MOZ_ASSERT(NS_IsMainThread());
+  StaticMutexAutoLock lock(sMutex);
+
+  // We are creating a manager for the UI process, inside the combined GPU/UI
+  // process. It is created more-or-less the same but we retain a reference to
+  // the parent to access state.
+  if (NS_WARN_IF(sInstance)) {
+    MOZ_ASSERT_UNREACHABLE("Already initialized");
+    return nullptr;
+  }
+
+  // The child is responsible for setting up the IPC channel in the same
+  // process case because if we open from the child perspective, we can do it
+  // on the main thread and complete before we return the manager handles.
+  RefPtr<CompositorManagerParent> parent =
+      new CompositorManagerParent(dom::ContentParentId());
+  parent->SetOtherProcessId(base::GetCurrentProcId());
+  return parent.forget();
+}
+
+/* static */
+bool CompositorManagerParent::Create(
+    Endpoint<PCompositorManagerParent>&& aEndpoint,
+    dom::ContentParentId aChildId, bool aIsRoot) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  // We are creating a manager for the another process, inside the GPU process
+  // (or UI process if it subsumbed the GPU process).
+  MOZ_ASSERT(aEndpoint.OtherPid() != base::GetCurrentProcId());
+
+  if (!CompositorThreadHolder::IsActive()) {
+    return false;
+  }
+
+  RefPtr<CompositorManagerParent> bridge =
+      new CompositorManagerParent(aChildId);
+
+  RefPtr<Runnable> runnable =
+      NewRunnableMethod<Endpoint<PCompositorManagerParent>&&, bool>(
+          "CompositorManagerParent::Bind", bridge,
+          &CompositorManagerParent::Bind, std::move(aEndpoint), aIsRoot);
+  CompositorThread()->Dispatch(runnable.forget());
+  return true;
+}
+
+/* static */
+already_AddRefed<CompositorBridgeParent>
+CompositorManagerParent::CreateSameProcessWidgetCompositorBridge(
+    CSSToLayoutDeviceScale aScale, const CompositorOptions& aOptions,
+    bool aUseExternalSurfaceSize, const gfx::IntSize& aSurfaceSize,
+    uint64_t aInnerWindowId) {
+  MOZ_ASSERT(XRE_IsParentProcess());
+  MOZ_ASSERT(NS_IsMainThread());
+
+  // When we are in a combined UI / GPU process, InProcessCompositorSession
+  // requires both the parent and child PCompositorBridge actors for its own
+  // construction, which is done on the main thread. Normally
+  // CompositorBridgeParent is created on the compositor thread via the IPDL
+  // plumbing (CompositorManagerParent::AllocPCompositorBridgeParent). Thus to
+  // actually get a reference to the parent, we would need to block on the
+  // compositor thread until it handles our constructor message. Because only
+  // one one IPDL constructor is permitted per parent and child protocol, we
+  // cannot make the normal case async and this case sync. Instead what we do
+  // is leave the constructor async (a boon to the content process setup) and
+  // create the parent ahead of time. It will pull the preinitialized parent
+  // from the queue when it receives the message and give that to IPDL.
+
+  // Note that the static mutex not only is used to protect sInstance, but also
+  // mPendingCompositorBridges.
+  StaticMutexAutoLock lock(sMutex);
+  if (NS_WARN_IF(!sInstance)) {
+    return nullptr;
+  }
+
+  TimeDuration vsyncRate =
+      gfxPlatform::GetPlatform()->GetGlobalVsyncDispatcher()->GetVsyncRate();
+
+  RefPtr<CompositorBridgeParent> bridge = new CompositorBridgeParent(
+      sInstance, aScale, vsyncRate, aOptions, aUseExternalSurfaceSize,
+      aSurfaceSize, aInnerWindowId);
+
+  sInstance->mPendingCompositorBridges.AppendElement(bridge);
+  return bridge.forget();
+}
+
+CompositorManagerParent::CompositorManagerParent(
+    dom::ContentParentId aContentId)
+    : mContentId(aContentId),
+      mCompositorThreadHolder(CompositorThreadHolder::GetSingleton()) {}
+
+CompositorManagerParent::~CompositorManagerParent() = default;
+
+void CompositorManagerParent::Bind(
+    Endpoint<PCompositorManagerParent>&& aEndpoint, bool aIsRoot) {
+  MOZ_ASSERT(CompositorThreadHolder::IsInCompositorThread());
+  if (NS_WARN_IF(!aEndpoint.Bind(this))) {
+    return;
+  }
+
+  BindComplete(aIsRoot);
+}
+
+void CompositorManagerParent::BindComplete(bool aIsRoot) {
+  MOZ_ASSERT(CompositorThreadHolder::IsInCompositorThread() ||
+             NS_IsMainThread());
+
+  StaticMutexAutoLock lock(sMutex);
+  if (aIsRoot) {
+    sInstance = this;
+  }
+
+#ifdef COMPOSITOR_MANAGER_PARENT_EXPLICIT_SHUTDOWN
+  if (!sActiveActors) {
+    sActiveActors = new nsTArray<CompositorManagerParent*>();
+  }
+  sActiveActors->AppendElement(this);
+#endif
+}
+
+void CompositorManagerParent::ActorDestroy(ActorDestroyReason aReason) {
+  SharedSurfacesParent::DestroyProcess(OtherPid());
+
+  GetCurrentSerialEventTarget()->Dispatch(
+      NewRunnableMethod("layers::CompositorManagerParent::DeferredDestroy",
+                        this, &CompositorManagerParent::DeferredDestroy));
+
+  StaticMutexAutoLock lock(sMutex);
+  if (sInstance == this) {
+    sInstance = nullptr;
+  }
+
+#ifdef COMPOSITOR_MANAGER_PARENT_EXPLICIT_SHUTDOWN
+  if (sActiveActors) {
+    sActiveActors->RemoveElement(this);
+  }
+#endif
+}
+
+void CompositorManagerParent::DeferredDestroy() {
+  mCompositorThreadHolder = nullptr;
+}
+
+#ifdef COMPOSITOR_MANAGER_PARENT_EXPLICIT_SHUTDOWN
+/* static */
+void CompositorManagerParent::ShutdownInternal() {
+  UniquePtr<nsTArray<CompositorManagerParent*>> actors;
+
+  // We move here because we may attempt to acquire the same lock during the
+  // destroy to remove the reference in sActiveActors.
+  {
+    StaticMutexAutoLock lock(sMutex);
+    actors = WrapUnique(sActiveActors.forget());
+  }
+
+  if (actors) {
+    for (auto& actor : *actors) {
+      actor->Close();
+    }
+  }
+}
+#endif  // COMPOSITOR_MANAGER_PARENT_EXPLICIT_SHUTDOWN
+
+/* static */
+void CompositorManagerParent::Shutdown() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+#ifdef COMPOSITOR_MANAGER_PARENT_EXPLICIT_SHUTDOWN
+  CompositorThread()->Dispatch(NS_NewRunnableFunction(
+      "layers::CompositorManagerParent::Shutdown",
+      []() -> void { CompositorManagerParent::ShutdownInternal(); }));
+#endif
+}
+
+already_AddRefed<PCompositorBridgeParent>
+CompositorManagerParent::AllocPCompositorBridgeParent(
+    const CompositorBridgeOptions& aOpt) {
+  switch (aOpt.type()) {
+    case CompositorBridgeOptions::TContentCompositorOptions: {
+      RefPtr<ContentCompositorBridgeParent> bridge =
+          new ContentCompositorBridgeParent(this);
+      return bridge.forget();
+    }
+    case CompositorBridgeOptions::TWidgetCompositorOptions: {
+      // Only the UI process is allowed to create widget compositors in the
+      // compositor process.
+      gfx::GPUParent* gpu = gfx::GPUParent::GetSingleton();
+      if (NS_WARN_IF(!gpu || OtherPid() != gpu->OtherPid())) {
+        MOZ_ASSERT_UNREACHABLE("Child cannot create widget compositor!");
+        break;
+      }
+
+      const WidgetCompositorOptions& opt = aOpt.get_WidgetCompositorOptions();
+      RefPtr<CompositorBridgeParent> bridge = new CompositorBridgeParent(
+          this, opt.scale(), opt.vsyncRate(), opt.options(),
+          opt.useExternalSurfaceSize(), opt.surfaceSize(), opt.innerWindowId());
+      return bridge.forget();
+    }
+    case CompositorBridgeOptions::TSameProcessWidgetCompositorOptions: {
+      // If the GPU and UI process are combined, we actually already created the
+      // CompositorBridgeParent, so we need to reuse that to inject it into the
+      // IPDL framework.
+      if (NS_WARN_IF(OtherPid() != base::GetCurrentProcId())) {
+        MOZ_ASSERT_UNREACHABLE("Child cannot create same process compositor!");
+        break;
+      }
+
+      // Note that the static mutex not only is used to protect sInstance, but
+      // also mPendingCompositorBridges.
+      StaticMutexAutoLock lock(sMutex);
+      if (mPendingCompositorBridges.IsEmpty()) {
+        break;
+      }
+
+      RefPtr<CompositorBridgeParent> bridge = mPendingCompositorBridges[0];
+      mPendingCompositorBridges.RemoveElementAt(0);
+      return bridge.forget();
+    }
+    default:
+      break;
+  }
+
+  return nullptr;
+}
+
+mozilla::ipc::IPCResult CompositorManagerParent::RecvAddSharedSurface(
+    const wr::ExternalImageId& aId, SurfaceDescriptorShared&& aDesc) {
+  SharedSurfacesParent::Add(aId, std::move(aDesc), OtherPid());
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult CompositorManagerParent::RecvRemoveSharedSurface(
+    const wr::ExternalImageId& aId) {
+  SharedSurfacesParent::Remove(aId);
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult CompositorManagerParent::RecvReportSharedSurfacesMemory(
+    ReportSharedSurfacesMemoryResolver&& aResolver) {
+  SharedSurfacesMemoryReport report;
+  SharedSurfacesParent::AccumulateMemoryReport(OtherPid(), report);
+  aResolver(std::move(report));
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult CompositorManagerParent::RecvNotifyMemoryPressure() {
+  nsTArray<PCompositorBridgeParent*> compositorBridges;
+  ManagedPCompositorBridgeParent(compositorBridges);
+  for (auto bridge : compositorBridges) {
+    static_cast<CompositorBridgeParentBase*>(bridge)->NotifyMemoryPressure();
+  }
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult CompositorManagerParent::RecvReportMemory(
+    ReportMemoryResolver&& aResolver) {
+  MOZ_ASSERT(CompositorThreadHolder::IsInCompositorThread());
+  MemoryReport aggregate;
+  PodZero(&aggregate);
+
+  // Accumulate RenderBackend usage.
+  nsTArray<PCompositorBridgeParent*> compositorBridges;
+  ManagedPCompositorBridgeParent(compositorBridges);
+  for (auto bridge : compositorBridges) {
+    static_cast<CompositorBridgeParentBase*>(bridge)->AccumulateMemoryReport(
+        &aggregate);
+  }
+
+  // Accumulate Renderer usage asynchronously, and resolve.
+  //
+  // Note that the IPDL machinery requires aResolver to be called on this
+  // thread, so we can't just pass it over to the renderer thread. We use
+  // an intermediate MozPromise instead.
+  wr::RenderThread::AccumulateMemoryReport(aggregate)->Then(
+      CompositorThread(), __func__,
+      [resolver = std::move(aResolver)](MemoryReport aReport) {
+        resolver(aReport);
+      },
+      [](bool) {
+        MOZ_ASSERT_UNREACHABLE("MemoryReport promises are never rejected");
+      });
+
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult CompositorManagerParent::RecvInitCanvasManager(
+    Endpoint<PCanvasManagerParent>&& aEndpoint) {
+  gfx::CanvasManagerParent::Init(std::move(aEndpoint));
+  return IPC_OK();
+}
+
+/* static */
+void CompositorManagerParent::NotifyWebRenderError(wr::WebRenderError aError) {
+  MOZ_ASSERT(CompositorThreadHolder::IsInCompositorThread());
+
+  StaticMutexAutoLock lock(sMutex);
+  if (NS_WARN_IF(!sInstance)) {
+    return;
+  }
+  Unused << sInstance->SendNotifyWebRenderError(aError);
+}
+
+}  // namespace layers
+}  // namespace mozilla